USB-1024LS
24-bit Digital I/O
Low-speed USB 2.0 device
User’s Guide
USB-1024LS
USB-based Digital I/O Module
User's Guide
Document Revision 2, May, 2006
© Copyright 2006, Measurement Computing Corporation
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iii
Table of Contents
Preface
About this User's Guide .......................................................................................................................v
What you will learn from this user's guide .........................................................................................................v
Conventions in this user's guide .........................................................................................................................v
Where to find more information.........................................................................................................................v
Chapter 1
Introducing the USB-1024LS............................................................................................................ 1-1
USB-1024LS block diagram........................................................................................................................... 1-2
Software features............................................................................................................................................ 1-2
Connecting a USB-1024LS to your computer is easy .................................................................................... 1-3
Chapter 2
Installing the USB-1024LS................................................................................................................ 2-1
What comes with your USB-1024LS shipment? ............................................................................................ 2-1
Hardware ....................................................................................................................................................................... 2-1
Additional documentation.............................................................................................................................................. 2-1
Unpacking the USB-1024LS.......................................................................................................................... 2-1
Installing the software .................................................................................................................................... 2-2
Installing the hardware ................................................................................................................................... 2-2
Chapter 3
Functional Details ............................................................................................................................. 3-1
External components ...................................................................................................................................... 3-1
USB connector............................................................................................................................................................... 3-1
LED ............................................................................................................................................................................... 3-1
Screw terminal wiring.................................................................................................................................................... 3-1
Main connector and pin out ........................................................................................................................................... 3-2
Digital I/O terminals (Port A0 to A7, Port B0 to B7, Port C0 to C7)............................................................................. 3-3
Power terminals ............................................................................................................................................................. 3-4
Ground terminals ...........................................................................................................................................................3-4
Counter terminal ............................................................................................................................................................ 3-4
Chapter 4
Specifications.................................................................................................................................... 4-1
Digital input / output....................................................................................................................................... 4-1
Counter ........................................................................................................................................................... 4-1
Power.............................................................................................................................................................. 4-1
General ........................................................................................................................................................... 4-2
Environmental ................................................................................................................................................ 4-2
Mechanical ..................................................................................................................................................... 4-2
Main connector and pin out............................................................................................................................ 4-3
iv
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide explains how to install, configure, and use the USB-1024LS so that you get the most out of its
USB digital I/O features.
This user's guide also refers you to related documents available on our web site, and to technical support
resources.
Conventions in this user's guide
For more information on …
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
<#:#> Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those assigned
to registers, bit settings, etc.
bold text Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes. For
example:
1. Insert the disk or CD and click the OK button.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase. For
example:
The InstaCal® installation procedure is explained in the Quick Start Guide.
Never touch the exposed pins or circuit connections on the board.
Where to find more information
Additional information about E-1608 hardware is available on our website at www.mccdaq.com. You can also
contact Measurement Computing Corporation by phone, fax, or email with specific questions.
Knowledgebase: kb.mccdaq.com
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: techsupport@mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
v
Introducing the USB-1024LS
This user's guide contains all of the information you need to connect the USB-1024LS measurement and
automation device to your computer and to other data acquisition hardware.
Chapter 1
The USB-DIO24/37 is a USB 1.1 low-speed module supported under popular Microsoft
systems. It is designed for USB 1.1 ports, and was tested for full compatibility with both USB 1.1 and USB 2.0
ports.
The USB-1024LS features 24 bits of digital I/O and one 32-bit external event counter. The device is powered
by the +5 volt USB supply. No external power is required.
An on-board industry standard 82C55 programmable peripheral interface chip provides the 24 discrete digital
I/O lines in four ports. You can configure each digital port independently for either input or output.
The USB-1024LS USB device is shown in Figure 1-1. All I/O connections are made to the screw terminals
located along each side of the USB-1024LS.
®
Windows® operating
Figure 1-1. USB-1024LS
1-1
USB-1024LS User's Guide Introducing the USB-1024LS
A
USB-1024LS block diagram
USB-1024LS functions are illustrated in the block diagram shown here.
USB
Compliant
Interface
1.1
USB
Microcontroller
82C55 DIO
Port
8
Screw terminal I/O connector
Figure 1-2. USB-1024LS functional block diagram
Port
B
8
Port
C HI
4
Port
C LO
-
32
4
Event Counter
1 channel
bit
1
Software features
For information on the features of InstaCal and the other software included with your USB-1024LS, refer to the
Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
.
Check www.mccdaq.com/download.htm
under less commonly used operating systems.
for the latest software version or versions of the software supported
1-2
USB-1024LS User's Guide Introducing the USB-1024LS
Connecting a USB-1024LS to your computer is easy
Installing a data acquisition device has never been easier.
! The USB-1024LS relies upon the Microsoft Human Interface Device (HID) class drivers. The HID class
drivers ship with every copy of Windows that is designed to work with USB ports. We use the Microsoft
HID because it is a standard, and its performance delivers full control and maximizes data transfer rates for
your USB-1024LS. No third-party device driver is required.
! The USB-1024LS is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts to
configure.
! You can connect the USB-1024LS before or after you install the software, and without powering down
your computer first. When you connect an HID to your system, your computer automatically detects it and
configures the necessary software. You can connect and power multiple HID peripherals to your system
using a USB hub.
! You can connect your system to various devices using a standard four-wire cable. The USB connector
replaces the serial and parallel port connectors with one standardized plug and port combination.
! You do not need a separate power supply module. The USB automatically delivers the electrical power
required by each peripheral connected to your system.
! Data can flow two ways between a computer and peripheral over USB connections.
1-3
Installing the USB-1024LS
What comes with your USB-1024LS shipment?
The following items are shipped with the USB-1024LS:
Hardware
! USB-1024LS
Chapter 2
! USB cable (2 meter length)
Additional documentation
In addition to this hardware user's guide, you should also receive the Quick Start Guide (available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
the software you received with your USB-1024LS and information regarding installation of that software.
Please read this booklet completely before installing any software or hardware.
). This booklet supplies a brief description of
Unpacking the USB-1024LS
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the USB-1024LS from its packaging, ground yourself using a wrist strap or by
simply touching the computer chassis or other grounded object to eliminate any stored static charge.
If your USB-1024LS is damaged, notify Measurement Computing Corporation immediately by phone, fax, or email. For international customers, contact your local distributor where you purchased the USB-1024LS.
! Phone: 508-946-5100 and follow the instructions for reaching Tech Support.
! Fax: 508-946-9500 to the attention of Tech Support
! Email: techsupport@mccdaq.com
2-1
USB-1024LS User's Guide Installing the USB-1024LS
Installing the software
Refer to the Quick Start Guide for instructions on installing the software on the Measurement Computing Data
Acquisition Software CD. This booklet is available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-
Quick-Start.pdf.
Installing the hardware
Be sure you are using the latest system software
Before you connect the USB-1024LS, make sure that you are using the latest versions of the USB drivers.
Before installing the USB-1024LS, download and install the latest Microsoft Windows updates. In particular,
when using Windows XP, make sure you have XP Hotfix KB822603 installed. This update is intended to
address a serious error in Usbport.sys when you operate a USB device. You can run Windows Update or
download the update from www.microsoft.com/downloads/details.aspx?familyid=733dd867-56a0-4956-b7fe-
e85b688b7f86&displaylang=en. For more information, refer to the Microsoft Knowledge Base article
"Availability of the Windows XP SP1 USB 1.1 and 2.0 update." This article is available at
support.microsoft.com/?kbid=822603.
To connect the USB-1024LS to your system, turn your computer on, and connect the USB cable to a USB port
on your computer or to an external USB hub that is connected to your computer. The USB cable provides power
and communication to the USB-1024LS.
When you connect the USB-1024LS for the first time, a
or dialog (other Windows version) displays as the USB-1024LS is detected by your computer.
Another Found New Hardware balloon or dialog opens after the first closes that identifies the USB-1024LS as
a USB Human Interface Device. This balloon or dialog indicates that your USB-1024LS is installed and ready
to use.
When the balloon or dialog closes, the LED on the USB-1024LS should flash and then remain lit. This indicates
that communication is established between the USB-1024LS and your computer.
Caution! Do not disconnect any device from the USB bus while the computer is communicating with the
USB-1024LS, or you may lose data and/or your ability to communicate with the USB-1024LS.
If the LED turns off
If the LED is illuminated but then turns off, the computer has lost communication with the USB-1024LS. To
restore communication, disconnect the USB cable from the computer, and then reconnect it. This action should
restore communication, at which time the LED will turn on.
Found New Hardware popup balloon (Windows XP)
2-2
Functional Details
External components
The USB-1024LS has the following external components, as shown in Figure 3-1.
! USB connector
! LED
! Screw terminal banks (2)
Chapter 3
LED
Screw terminal
Pins 1 to 20
Screw terminal
Pins 21 to 40
USB
connector / cable
Figure 3-1. USB-1024LS external components
USB connector
The USB connector is on the right side of the USB-1024LS housing. This connector provides +5 V power and
communication. The voltage supplied through the USB connector is system-dependent, and may be less than +5
V. No external power supply is required.
LED
The LED on the front of the housing indicates the communication status of the USB-1024LS. It uses up to 5
mA of current and cannot be disabled. defines the function of the USB-1024LS LED. Table 3-1
Table 3-1. LED Illumination
LED Illumination Indication
Steady green The USB-1024LS is connected to a computer or external USB hub.
Blinks continuously Data is being transferred.
Blinks three times Initial communication is established between the USB-1024LS and the computer.
Screw terminal wiring
The USB-1024LS has two rows of screw terminals – one row on the top edge of the housing, and one row on
the bottom edge. Each screw terminal bank provides 20 connections. Pin numbers are identified in . Figure 3-2
3-1
USB-1024LS User's Guide Functional Details
Pin 1Pin 20
Pin 21Pin 40
Figure 3-2. USB-1024LS screw terminal pin numbers
Screw terminal – pins 1-20
The screw terminals on the top edge of the USB-1024LS (pins 1 to 20) provide the following connections:
! Eight digital I/O connections (
! One counter connection (
! Five ground connections (
Port C0 to Port C7)
CTR)
GND)
Screw terminal – pins 21-40
The screw terminals on the bottom edge of the USB-1024LS (pins 21 to 40) provide the following connections:
! 16 digital I/O connections (
! One power connection (
! Three ground connections (
Port A0 to Port A7, and Port B0 to Port B7)
PC+5 V)
GND)
Main connector and pin out
Connector type Screw Terminal
Wire gauge range 16 AWG to 30 AWG
3-2
USB-1024LS User's Guide Functional Details
20 CTR
19 GND
18 n/c
17 GND
16 n/c
15 GND
14 n/c
13 n/c
12 GND
11 n/c
10 n/c
9GND
8Port C7
7Port C6
6Port C5
5Port C4
4Port C3
3Port C2
2Port C1
1Port C0
GND 40
Port B7 39
Port B6 38
Port B5 37
Port B4 36
GND 31
PC+5V 30
GND 29
Port B3 35
Port B2 34
Port B1 33
Port A7 28
Port B0 32
Port A6 27
Port A5 26
Port A4 25
Port A3 24
Port A2 23
Port A1 22
Port A0 21
Digital I/O terminals (Port A0 to A7, Port B0 to B7, Port C0 to C7)
Connect up to 24 digital I/O lines to the screw terminal containing pins 1 to 8 (Port C0 to Port C7), pins 21 to
Port A0 to Port A7), and pins 32 to 39, (Port B0 to Port B7). Refer to the pinout diagram on page 2 for the
28 (
location of these pins. You can configure each digital port for either input or output.
When configured for input, you can use the USB-1024LS digital I/O terminals to detect the state of any TTL
level input. Refer to the switch shown in Fi and the schematic shown in . If the switch is set
gure 3-3
to the +5 V input, Port A0 reads TRUE (1). If you move the switch to GND, Port A0 reads FALSE.
Figure 3-3. Digital connection of Port A0 detecting the state of a switch
Figure 3-4
Port A0
+5V+GND
Figure 3-4. Schematic showing switch detection by digital channel Port A0
For more information on digital signal connections
For more information on digital signal connections and digital I/O techniques, refer to the Guide to Signal
Connections (available on our web site at www.mccdaq.com/signals/signals.pdf).
3-3
USB-1024LS User's Guide Functional Details
Power terminals
The PC +5 V connection (pin 30) is on the bottom screw terminal of the USB-1024LS. Refer to the pinout
diagram on page 3-2 for the location of this pin. This terminal draws power from the USB connector. The +5 V
screw terminal is a +5 volt output that is supplied by the computer.
Caution! The +5 V terminal is an output. Do not connect to an external power supply or you may damage
the USB-1024LS and possibly the computer.
The maximum total output current that can be drawn from all USB-1024LS connections (power and digital
outputs) is 500 mA. This maximum applies to most personal computers and self-powered USB hubs.
Bus-powered hubs and notebook computers may limit the maximum available output current to 100 mA.
Just connecting the USB-1024LS to your computer draws 18 mA of current from the USB +5 V supply. Once
you start running applications with the USB-1024LS, each DIO bit can draw up to 2.5 mA. The maximum
amount of +5V current available for external use, over and above that required by the USB-1024LS, is the
difference between the total current requirement of the USB-1024LS (based on the application), and the
allowed current draw of the PC platform (500 mA for desktop PCs and self-powered hubs, or 100 mA for
bus-powered hubs and notebook computers).
With all outputs at their maximum output current, you can calculate the total current requirement of the USB1024LS USB +5 V as follows:
(USB-1024LS @ 18 mA) + (24 DIO @ 2.5 mA ea) = 78 mA
For an application running on a PC or powered hub, this value yields a maximum user current of 500 mA−78
mA = 422 mA. This number is the total maximum available current at the PC+5V screw terminals.
Measurement Computing highly recommends that you figure in a safety factor of 20% below this maximum
current loading for your applications. A conservative, safe user maximum in this case would be 330 mA.
Since laptop computers typically allow up to 100 mA, the USB-1024LS in a fully-loaded configuration may be
above that allowed by the computer. In this case, you must determine the per-pin loading in the application to
ensure that the maximum loading criteria is met. The per-pin loading is calculated by simply dividing the +5 V
by the load impedance of the pin in question.
Ground terminals
The 8 ground (GND) connections are identical, and provide a common ground for all USB-1024LS functions.
Refer to the pinout diagram on page 3-2 for the location of the GND terminal pins.
Counter terminal
Pin 20 (CTR) is the input to the 32-bit external event counter. Refer to the pinout diagram on page 3-2 for the
location of this pin. The internal counter increments when the TTL levels transition from low to high. The
counter can count frequencies of up to 1 MHz.
3-4
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Digital input / output
Table 1. Digital I/O specifications
Digital type 82C55
Number of I/O 24 (Port A0 through Port C7)
Configuration 2 banks of 8 and 2 banks of 4, or
3 banks of 8
Pull up/pull-down configuration
Input high voltage 2.0 V min, 5.5 V absolute max
Input low voltage 0.8 V max, –0.5 V absolute min
Output high voltage (IOH = -2.5 mA) 3.0 V min
Output low voltage (IOH = -2.5 mA) 0.4 V max
Power up / reset state Input mode
All pins pulled up to Vs via 47K resistors (default). Selection available for
pull down to ground. Hardware selectable via zero ohm resistor.
Chapter 4
Counter
Table 2. Counter specifications
Counter type Event counter
Number of channels 1
Input source CTR screw terminal
Input type TTL, rising edge triggered
Resolution 32 bits
Schmidt trigger hysteresis 20 mV to 100 mV
Input leakage current ±1 µA
Maximum input frequency 1 MHz
High pulse width 500 ns min
Low pulse width 500 ns min
Input low voltage 0 V min, 1.0 V max
Input high voltage 4.0 V min, 15.0 V max
Power
Table 3. Power specifications
Parameter Conditions Specification
Supply current (Note 1) 20 mA typ, 40 mA max
Connected to Self-Powered Hub 4.5 V min, 5.25 V max +5V USB power available (Note 2)
Connected to Bus-Powered Hub 4.1 V min, 5.25 V max
Connected to Self-Powered Hub 460 mA max Output Current (Note 3)
Connected to Bus-Powered Hub 60 mA max
Note 1: This is the total current requirement for the USB-1024LS which includes up to 5mA for the
status LED.
4-1
USB-1024LS User's Guide Specifications
Note 2:
Self-powered refers to USB hubs and hosts with a power supply. Bus-powered refers to USB
hubs and hosts without their own power supply.
Note 3: This refers to the total amount of current that can be sourced from the USB +5V and digital
outputs.
General
Table 4. General specifications
Parameter Conditions Specification
25 °C ±30 ppm max USB controller clock error
0 to 70 °C ±50 ppm max
Device type USB 1.1 low-speed
Device compatibility USB 1.1, USB 2.0
Environmental
Table 5. Environmental specifications
Operating temperature range -0 to 70 °C
Storage temperature range -40 to 70 °C
Humidity 0 to 90% non-condensing
Mechanical
Table 6. Mechanical specifications
Dimensions 79 mm (L) x 82 mm (W) x 25 mm (H)
USB cable length 3 meters max
User connection length 3 meters max
4-2
USB-1024LS User's Guide Specifications
Main connector and pin out
Table 7. Connector specifications
Connector type Screw terminal
Wire gauge range 30-16 AWG
Table 8. Connector pin out
Pin Signal Name Pin Signal Name
1 Port C0 21 Port A0
2 Port C1 22 Port A1
3 Port C2 23 Port A2
4 Port C3 24 Port A3
5 Port C4 25 Port A4
6 Port C5 26 Port A5
7 Port C6 27 Port A6
8 Port C7 28 Port A7
9 GND 29 GND
10 n/c 30 PC+5V
11 n/c 31 GND
12 GND 32 Port B0
13 n/c 33 Port B1
14 n/c 34 Port B2
15 GND 35 Port B3
16 n/c 36 Port B4
17 GND 37 Port B5
18 n/c 38 Port B6
19 GND 39 Port B7
20 CTR 40 GND
4-3
Declaration of Conformity
Manufacturer: Measurement Computing Corporation
Address: 10 Commerce Way
Suite 1008
Norton, MA 02766
USA
Measurement Computing Corporation declares under sole responsibility that the product
USB-1024LS
to which this declaration relates is in conformity with the relevant provisions of the following standards or other
documents:
EU EMC Directive 89/336/EEC: Electromagnetic Compatibility, EN 61326 (1997) Amendment 1 (1998)
Emissions: Group 1, Class A
! EN 55011 (1990)/CISPR 11: Radiated and Conducted emissions.
Immunity: EN61326, Annex A
! IEC 1000-4-2 (1995): Electrostatic Discharge immunity, Criteria C.
! IEC 1000-4-3 (1995): Radiated Electromagnetic Field immunity Criteria A.
! IEC 1000-4-8 (1994): Power Frequency Magnetic Field immunity Criteria A.
Power line and I/O tests to IEC 1000-4-4, IEC 1000-4-5, IEC 1000-4-6, and IEC 1000-4-11 were not required.
The device is DC powered from an I/O cable which is less than three meters long.
Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
June, 2004. Test records are outlined in Chomerics Test Report #EMI3902.04.
We hereby declare that the equipment specified conforms to the above Directives and Standards.
Carl Haapaoja, Director of Quality Assurance
Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, Massachusetts 02766
(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com
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